I found BleachBit to be indispensable tool with flash installed Knoppix. People who update packages will find themselves in a situation where they are running out of space in no time. By deleting unnecessary localizations you will be able to mirror the entire Knoppix installation, install a few extra applications and still have enough space on the flash to run Knoppix as a normal OS. BleachBit simplifies the process of deleting localizations and temporary files.
I am using 4 GB usb stick and I am able to mirror almost the entire Knoppix image on the persistent store + addition of at least 50 apps not included originally on CD just by deleting temp files and localizations regularly.
I think it would be a good addition to any future Knoppix release